JP3670547B2 - Power shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power shutoff device that shuts off a power supply circuit using, for example, a rotational operation of a motor, and in particular forcing a power supply circuit when an abnormality occurs such as when a wire harness is shorted or when a vehicle collides, and The present invention relates to a power shut-off device that can be reliably shut off and has a structure suitable for downsizing.
[0002]
[Prior art]
FIG. 7 is a system configuration diagram showing an example of an electrical system to which a conventional power shut-off device is applied. As shown in the figure, this electrical system 100 forms a power supply circuit by connecting a vehicle battery 101 and loads 102 to 104 provided in each part of the vehicle by a wire harness 106 provided with electric wires 105. The power shut-off device 107 is inserted in the power circuit.
[0003]
The power shut-off device 107 locks as described below with reference to FIG. 8 when a circuit shut-off signal generated by the ECU 108 is input when an abnormality occurs such as when the wire harness 106 is short-circuited or a vehicle collides. It is cancelled | released and the electric power feeding from the battery 101 to each load 102-104 grade | etc., Can be stopped.
[0004]
FIG. 8 is a configuration diagram of a solenoid type power cutoff device 107A showing an example of the power cutoff device 107 of FIG. 7, in which FIG. 8 (a) is a top view and FIG. 8 (b) is a side view.
[0005]
As shown in FIG. 8A, the solenoid type power shut-off device 107A has a shaft 111 disposed on the base body 110. The shaft 111 receives a circuit shut-off signal from the solenoid power shut-off device 107A. In the initial state, the shafts 111 are held by the locks 113 that hold the shafts 111 from above, so that the terminals 112a and 112b are connected by the shafts 111 and are electrically connected.
[0006]
In this state, the current of the power supply circuit flows through the path of the terminal 112a → the shaft 111 → the terminal 112b, and since the terminals 112a and 112b have a multipoint contact spring structure, a large current can be applied.
[0007]
Further, when the circuit interruption signal is input, the solenoid 115 is energized to attract the plunger 116, and the lock 113 is released from the engaged state with the shaft 111, whereby the shaft 111 is urged from the release spring 114. Since the terminal 112a and the terminal 112b are disconnected by being pushed forward by the pressing force, the terminals 112a and 112b are electrically opened, and the power supply from the battery 101 to the loads 102 to 104 is stopped. Will be.
[0008]
[Problems to be solved by the invention]
However, in the conventional structure of FIG. 8, when an impact force is applied in the axial direction of the shaft 111 indicated by the arrow A in FIG. 8A, the plunger 116 of the solenoid 115 may malfunction due to pulling the lever 118. When this malfunction occurs, there is a problem that the lock 113 is released from the engaged state with the shaft 111. Further, there is a problem that the current technology level cannot cope with the demand for further miniaturizing the solenoid 115.
[0009]
In view of the above circumstances, the present invention provides a power shut-off device having a structure suitable for downsizing while forcibly and surely shutting off a power circuit when a wire harness is short-circuited or when an abnormality occurs such as a vehicle collision. It is intended to provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in claim 1, a pair of terminals inserted in a power supply circuit connecting the battery of the vehicle and each load provided in each part of the vehicle, and sliding between these terminals A shaft that can be moved toward and away from each other by moving, and the shaft is slid from an initial position for connecting the terminals to a blocking position for disconnecting the terminals to block the power circuit. In the power shut-off device, a release spring that urges the shaft to urge the shaft to slide from the initial position to the shut-off position, and a rotation axis along a plane perpendicular to the slide movement direction of the shaft It is assembled in a state where it can be rotated, and the rotation angle of the rotation shaft is changed, and the shaft pressed by the release spring is locked at the initial position. On the other hand, it is characterized by comprising a lock that is ready to move to the blocking position to release the engagement.
[0011]
According to the first aspect of the present invention, only the rotation angle of the rotation shaft in the lock assembled to be rotatable around the rotation axis along the plane orthogonal to the sliding movement direction of the shaft is changed, and the power supply circuit is interposed. The shaft pushed by the release spring is locked at the initial position where the pair of inserted terminals are connected, and the lock is released and the pair of terminals inserted in the power supply circuit is separated. Since it can be moved to the shut-off position to be put into a state, a power shut-off device using a torque generating source such as a motor that is simpler and smaller than a solenoid can be constructed.
[0012]
According to a second aspect of the present invention, in the power shut-off device according to the first aspect, the lock is characterized in that a tapered side is formed at a portion where the shaft is stopped.
[0013]
According to the second aspect of the present invention, since the lock formed with the tapered side is used at the portion where the shaft is to be stopped, so that the interference with the shaft at the time of the shut-off operation can be immediately avoided. This is useful for reducing the size of the power shut-off device by designing it small.
[0014]
According to Claim 3, in the power shut-off device according to any one of Claims 1 and 2, the lock follows the rotational operation of a motor driven when a circuit shut-off signal is input to the power shut-off device. The rotation angle of the rotation shaft is changed, and the locking with respect to the shaft is released.
[0015]
According to the third aspect of the present invention, when the circuit interruption signal is input to the motor, the rotation angle of the rotation shaft is changed and the lock of the lock on the shaft is released. When the abnormality stops, the power shut-off device is reliably shut off.
[0016]
The power shut-off device according to claim 3, wherein the lock has a built-in gear as the motor, wherein a disc is attached with a center aligned with a drive shaft, and a protrusion is provided on an outer peripheral portion of the disc. A portion to be connected to the protrusion is detached from the protrusion after the motor is applied and the blocking operation is completed.
[0017]
According to claim 4, the torque generating source for operating the lock is a motor with a built-in gear, and even if an impact other than when the abnormality is stopped such as when the wire harness is short-circuited or when the vehicle collides, Since the state in which the shaft is locked can be maintained by the motor with a built-in gear, it is possible to avoid a situation in which the shaft is slid and the shaft is slid due to the impact or the like.
[0018]
Moreover, since the part connected with the protrusion of the disc attached to the motor with a built-in gear is detached from the protrusion after the end of the blocking operation, the shaft can be reset to the initial position immediately after the end of the blocking operation. Therefore, the operation of bringing the power supply circuit into the closed state again can be easily performed.
[0019]
According to a fifth aspect of the present invention, in the power shut-off device according to any one of the first to fourth aspects, the lock is configured such that the part side where the shaft is stopped is larger and the other part side is smaller so that the rotating shaft is smaller. It is characterized by an eccentric arrangement.
[0020]
According to the fifth aspect of the present invention, since the lock on which the rotation shaft is eccentrically arranged is used so that the portion side where the shaft is stopped is larger and the other portion side is smaller, the radius of rotation of the lock is made possible. This is useful for reducing the size of the power shut-off device by designing it to be small.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a system configuration diagram showing an embodiment of an electrical system to which a power shut-off device according to the present invention is applied.
[0022]
As shown in the figure, this electrical system 1 includes a vehicle battery 2 and loads such as a starter 3, an alternator 4, an ignition switch (IGN.SW) 5, and other loads 6 provided in each part of the vehicle. A power supply circuit is formed by connecting with a wire harness 8 configured using the electric wire 7, and a power cut-off device 9 according to the present invention is inserted in the power supply circuit. In addition, 10 is a G sensor, 11 is an air bag ECU, and these are used for operating the power shut-off device 9. Further, 12 is a hazard, 13 is a telephone (PHONE), 14 is a door lock (D / L), and these are examples of system components that do not shut off the power circuit by the power shut-off device 9.
[0023]
In this electrical system, as shown in the shut-off flow in FIG. 2, when the vehicle collides with an object such as a preceding vehicle and a collision signal is output from the G sensor 10 to the airbag ECU 11 (step ST1), the airbag The ECU 11 generates a circuit interruption signal, and the generated circuit interruption signal is output to the power supply interruption device 9 (step ST2).
[0024]
As a result, the power shut-off device 9 shuts off the power circuit from the battery 2 to the starter 3, the alternator 4, the ignition switch (IGN.SW) 5, etc., as will be described below with reference to FIGS. Power supply to the load can be stopped (step ST3).
[0025]
FIG. 3 is a sectional side view showing a main part of the configuration of one embodiment of the power shut-off device 9 according to the present invention, and FIG. 4 is a cross-sectional view taken along line AA in the power shut-off device 9 of FIG.
[0026]
This power shut-off device 9 can contact and separate a pair of terminals 15a and 15b inserted in a power circuit connecting a battery of a vehicle and each load provided in each part of the vehicle, and sliding between the terminals 15a and 15b. And a shaft 16.
[0027]
The shaft 16 is urged by a pressing force to slide the shaft 16 from the initial position where the terminals 15a and 15b are connected to the disconnected position where the terminals 15a and 15b are disconnected from each other. Is done.
[0028]
Further, before the shaft 16 is actuated (in the state shown in the figure), the shaft 16 pushed in the sliding movement direction by the release spring 17 is secured in order to secure the connection state by the shaft 16 between the terminals 15a and 15b. At the initial position, it is locked and locked by a lock 18.
[0029]
The lock 18 is incorporated so as to be rotatable around a rotation shaft 19 along a plane orthogonal to the slide movement direction of the shaft 16, and is also provided at a contact portion 20 for stopping the shaft 16 during a blocking operation. The taper side 21 is formed so that the interference with the shaft 16 can be immediately avoided. Further, the lock 18 is biased toward the abutting wall 21A by the torsion spring.
[0030]
As a torque generation source for operating the lock 18, a gear built-in motor 22 is applied. The gear built-in motor 22 is attached with a disk 24 with the center aligned with the drive shaft 23, and an outer periphery of the disk 24. A protrusion 25 is provided on the portion.
[0031]
On the other hand, the lock 18 is formed in the shape of an opening recess so that the engagement portion 26 to be connected to the protrusion 25 after the blocking operation is finished can be detached from the protrusion 25.
[0032]
Therefore, the lock 18 follows the rotational operation of the gear built-in motor 22 that is driven when the circuit cutoff signal is input, and the rotational angle of the rotational shaft 19 is in the locked state (before release) shown in FIG. The state can be changed to the release state shown in FIG.
[0033]
That is, in the locked state shown in FIG. 5A, the lock 18 is held at a position where the projection 25 of the disk 24 is rotated 30 degrees counterclockwise from the neutral position N. In this held state, the locking portion 20 is held. The distal end side portion of the shaft 16 is stopped and locked in parallel.
[0034]
In the released state shown in FIG. 5B, the lock 18 is held at a position where the protrusion 25 of the disc 24 is rotated 30 degrees to the right from the neutral position N. In this held state, the lock 18 is inclined by 29 degrees. Since the taper side 21 of the stopper portion 20 is parallel to the tip side portion of the shaft 16 and the stopper of the shaft 16 by the lock 18 is released, the shaft 16 operates and slides to the blocking position.
[0035]
After the operation of the shaft 16 (lock 18), as shown in FIG. 6, since the shaft 16 does not exist at the position where the terminals 15a and 15b are provided, the terminals 15a and 15b are separated from each other, and the power supply circuit Will be cut off.
[0036]
As described above, in the case of the configuration of the present embodiment, the rotation angle of the rotation shaft 19 in the lock 18 assembled so as to be rotatable around the rotation shaft 19 along a plane orthogonal to the sliding movement direction of the shaft 16. The shaft 16 pressed by the release spring 17 can be locked at the initial position where the pair of terminals 15a and 15b inserted in the power supply circuit are connected, and the locking can be Since it can be released and moved between the pair of terminals 15a and 15b inserted in the power supply circuit to the shut-off position where the terminals 15a and 15b are disengaged, the gear built-in motor 22 which is a simple and small torque generation source compared to the solenoid can be provided. You can build a power shut-off device that you use
[0037]
Further, since the lock 18 formed with the tapered side 21 is used for the stop portion 20 for stopping the shaft 16 so that the interference with the shaft 16 during the blocking operation can be immediately avoided, the radius of rotation of the lock 18 is set. It is useful for miniaturizing the power shut-off device by designing it as small as possible.
[0038]
Further, when a circuit interruption signal is inputted to the motor 22 with built-in gear, the rotation angle of the rotary shaft 19 is changed and the lock 18 is unlocked from the shaft 16. When the abnormality occurs, the power shut-off device is reliably shut off.
[0039]
The torque generating source for operating the lock 18 is a motor 22 with a built-in gear, and the shaft 16 is engaged even if an impact other than when the abnormality is stopped such as when the wire harness is short-circuited or when the vehicle collides. Since the stopped state can be maintained by the gear built-in motor 22, it is possible to avoid a situation in which the lock 18 is released due to the impact or the like and the shaft 16 slides.
[0040]
Further, since the engaging portion 26 of the lock 18 to be connected to the protrusion 25 of the disc 24 attached to the geared motor 22 is detached from the projection 25 after the interruption operation is completed, the shaft 16 is immediately initialized immediately after the interruption operation is completed. Since it can be reset to the position and locked by the lock 18, the operation of bringing the power supply circuit into the closed state again can be easily performed.
[0041]
In addition, since the lock 18 having the rotational shaft 19 eccentrically arranged is used so that the portion side where the shaft 16 is stopped is larger and the other portion side is smaller, the radius of rotation of the lock is made as much as possible. This is useful for reducing the size of the power shut-off device by designing it to a small size.
[0042]
【The invention's effect】
As described above, according to the first aspect of the present invention, the rotation angle of the rotation shaft in the lock assembled to be rotatable about the rotation axis along the plane orthogonal to the sliding movement direction of the shaft is changed. By simply doing, the shaft pushed by the release spring is locked at the initial position where the pair of terminals inserted in the power circuit are connected, and the lock is released and the power circuit is Since it can be made to move to the interruption | blocking position which makes a separation state between a pair of inserted terminals, compared with a solenoid, the power interruption apparatus using torque generation sources, such as a small motor, can be constructed | assembled.
[0043]
According to the second aspect of the present invention, since the lock having a tapered side is used at the portion where the shaft is stopped and the interference with the shaft at the time of the blocking operation can be immediately avoided, the radius of rotation of the lock is made possible. This is useful for reducing the size of the power shut-off device by designing it to be small.
[0044]
According to the third aspect of the present invention, when the circuit cutoff signal is input to the motor, the rotation angle of the rotating shaft is changed and the lock on the shaft is unlocked. The power shut-off device is reliably shut off when an abnormality such as the above occurs.
[0045]
According to the invention of claim 4, even if the torque generating source for operating the lock is a gear built-in motor and an impact other than when the wire harness is short-circuited or when an abnormality such as a vehicle collision is stopped is applied to the power shut-off device Since the state where the shaft is locked can be maintained by the gear built-in motor, it is possible to avoid a situation where the lock is released due to the impact or the like and the shaft slides.
[0046]
Moreover, since the part connected with the protrusion of the disc attached to the motor with a built-in gear is detached from the protrusion after the end of the blocking operation, the shaft can be reset to the initial position immediately after the end of the blocking operation. Therefore, the operation of bringing the power supply circuit into the closed state again can be easily performed.
[0047]
According to the fifth aspect of the present invention, since the portion on which the shaft is stopped is larger and the other portion side is smaller, the lock with the eccentric rotation shaft is used. This is useful in reducing the size of the power shut-off device by designing as small as possible. According to the present invention, it is possible to forcibly and surely shut off a power circuit when an abnormality such as a short of a wire harness or a vehicle collision occurs and to provide a power shut-off device having a structure suitable for downsizing. Can do.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing an embodiment of an electrical system to which a power shut-off device according to the present invention is applied.
FIG. 2 is a flowchart showing a shut-off flow of the electrical system of FIG.
FIG. 3 is a cross-sectional side view of a main part showing a configuration of an embodiment of a power shut-off device according to the present invention in a state before operation.
4 is a cross-sectional view taken along the line AA in the power shut-off device of FIG. 3;
FIG. 5 is an explanatory diagram of an operation of changing from a locked state (a state before release) due to a lock to a released state in the power shutoff device of FIG. 3;
6 is a side cross-sectional view showing a main part of a configuration of an embodiment of the power shut-off device of FIG. 3 in a state before operation.
FIG. 7 is a system configuration diagram showing an example of an electrical system to which a conventional power shut-off device is applied.
FIG. 8 is a configuration diagram illustrating an example of a conventional power shut-off device.
[Explanation of symbols]
1 Electrical System 2 Battery 3 Starter 4 Alternator 5 Ignition Switch (IGN.SW)
6 Other load 7 Electric wire 8 Wire harness 9 Power shut-off device 10 G sensor 11 Airbag ECU
12 Hazard 13 Telephone 14 Door lock 15a, 15b Terminal 16 Shaft 17 Release spring 18 Lock 19 Rotating shaft 20 Stopping part 21 Tapered side 22 Gear built-in motor 23 Drive shaft 24 Disk 25 Protrusion 26 Engagement part

Claims (5)

It has a pair of terminals inserted in a power supply circuit that connects a vehicle battery and each load provided in each part of the vehicle, and a shaft that can be connected and separated by sliding movement between these terminals, and connects the terminals. In the power shutoff device that shuts off the power supply circuit by sliding the shaft from the initial position to be in a state to the shutoff position in which the terminals are separated from each other,
A release spring that biases the shaft with a pressing force for sliding the shaft from the initial position to the blocking position;
The shaft is assembled in a state where it can be rotated around a rotation axis along a plane orthogonal to the sliding movement direction of the shaft, and the rotation angle of the rotation shaft is changed to the shaft pressed by the release spring, While locking at the initial position, the lock that releases the lock and moves to the blocking position,
A power shut-off device comprising: The power shut-off device according to claim 1,
The lock is formed with a tapered side at a portion where the shaft is stopped.
A power shut-off device. The power shut-off device according to any one of claims 1 and 2,
The lock changes the rotation angle of the rotating shaft following the rotation operation of a motor driven when a circuit cutoff signal is input to the power cutoff device, and releases the lock on the shaft.
A power shut-off device. The power shut-off device according to claim 3,
As for the lock, as the motor, a disk is attached with a center aligned with the drive shaft, and a gear built-in motor provided with a protrusion on the outer periphery of the disk is applied. Is detached from the protrusion,
A power shut-off device. The power shut-off device according to any one of claims 1 to 4,
The lock has an eccentric arrangement of the rotating shaft in a relationship where the part side to stop the shaft is large and the other part side is small,
A power shut-off device.

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